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Need idea to protect car gadgets from voltage spikes.

Discussion in 'Electronic Basics' started by Sam Nickaby, Feb 11, 2006.

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  1. Sam Nickaby

    Sam Nickaby Guest

    I've heard of stories that the surges from the touching of the battery cables
    together can destroy sensitive electronics. It's common to see people
    run a motor and fumble with the jumper cables at the same time. This is
    an accident waiting to happen. What is the best way to protect car
    electronics such as the car's computer or the auto alarms from voltage
    spikes from the accidental shorting of the battery jumper cables
    without using a fuse?

  2. John S.

    John S. Guest

    The best way to avoid that problem is to follow the usually detailed
    instructions in the owners manual. The manual for both of my cars has
    detailed information about how to jumper a battery, how to connect and
    disconnect battery terminals, etc.
  3. Rich Grise

    Rich Grise Guest

    Follow the car manufacturer's procedure for jump starting. Typically, you
    separate the cables - clamp the red positive to positive, and start the
    helper car motor, then clamp the black one to the negative battery post
    of the helper car, and clamp it to some piece of metal that's connected
    to the car chassis, like where the negative cable on the dead car bolts to
    the engine block; then rev the helper car for a while, to put _some_
    charge on the dead one, and it should start right up. Then, remove the
    cables in the reverse order that you hooked them up.

    Do _NOT_ try this without an actual battery in the car, however. That
    _will_ give you destructive surges as soon as you take the battery out of
    the circuit.

    Good Luck!
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